Here’s something they don’t teach you in acting school. When you’re making a movie and running for your life, you need to look like it. You need to go all out, eyes wild with fear, arms flailing.

Look like Pierce Brosnan running from this or that explosion in a couple of Bond pictures, like Franka Potente in “Run Lola Run.”
Try not to look like Robert Redford in “The Natural,” guarded, scared of falling, an old man pretending to be a young man running through a wheat field.

Amanda Seyfried is a manic, paranoid survivor of a “Silence of the Lambs” serial killer in “Gone.” She lived to tell the tale. She’s sure that her sister (Emily Wickersham) has been kidnapped by the same guy, that she only has until sunset before sister Molly is killed.

And not for one second do you believe Seyfried is manic. A fine actress on most occasions, here she’s loping along like the pretty girl scared of mussing her hair and makeup in gym class. There’s nothing in the film — which lacks urgency — or her eyes or physical demeanor that suggests panic, fear, desperation.

And Jill Conway is desperate. She was abducted a year ago, and escaped. No one believed her.

“He’s come back for me. He took my sister because I wasn’t there!”

The Portland, Oregon cops are tired of her routine. They won’t look for her sister. But when Jill, who sizes up the “kidnapping” as if she’s been expecting it, sets out to solve the case in the few hours she thinks Molly has left, every cop in town is sent out to stop her.

“Gone” is a 95 minute thriller that hinges on whether or not we believe Jill — who is on medication since her trauma, who was institutionalized after it as well — is right, or if this is all in her head.

Every man she meets is a threat. Could the “kidnapper” be the creepy locksmith, the creepy customer in her diner, the creepy janitor, the creepy cop (Wes Bentley)? But the movie fails to do much with that mystery. That makes for a thriller that feels sedate and slow, and a big payoff that feels like a cheat.

And Seyfried never sells “crazy.” She didn’t get the direction or the number of takes necessary to work. Or maybe she was that worried about her perfect hair and makeup.